G01F 23/30
Indicating or measuring liquid level or level of fluent solid material: by
Official title: by floats
G01F23/30 (Indicating or measuring liquid level or level of fluent solid material: by) appears on 1,866 US grants and 1,330 published applications in this corpus.
Search patents in G01F- Granted patents
- 1,866
- Published applications
- 1,330
- Assignees
- 944
- Inventors
- 3,271
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 24 | 0 |
| 1978 | 36 | 0 |
| 1979 | 20 | 0 |
| 1980 | 28 | 0 |
| 1981 | 20 | 0 |
| 1982 | 19 | 0 |
| 1983 | 14 | 0 |
| 1984 | 21 | 0 |
| 1985 | 21 | 0 |
| 1986 | 20 | 0 |
| 1987 | 25 | 0 |
| 1988 | 28 | 0 |
| 1989 | 49 | 0 |
| 1990 | 33 | 0 |
| 1991 | 53 | 0 |
| 1992 | 50 | 0 |
| 1993 | 34 | 0 |
| 1994 | 30 | 0 |
| 1995 | 20 | 0 |
| 1996 | 33 | 0 |
| 1997 | 35 | 0 |
| 1998 | 35 | 0 |
| 1999 | 39 | 0 |
| 2000 | 30 | 0 |
| 2001 | 44 | 12 |
| 2002 | 35 | 29 |
| 2003 | 38 | 34 |
| 2004 | 39 | 55 |
| 2005 | 29 | 47 |
| 2006 | 42 | 48 |
| 2007 | 29 | 67 |
| 2008 | 36 | 38 |
| 2009 | 35 | 38 |
| 2010 | 33 | 51 |
| 2011 | 25 | 38 |
| 2012 | 33 | 40 |
| 2013 | 25 | 47 |
| 2014 | 34 | 47 |
| 2015 | 49 | 83 |
| 2016 | 57 | 81 |
| 2017 | 67 | 69 |
| 2018 | 47 | 75 |
| 2019 | 74 | 74 |
| 2020 | 74 | 63 |
| 2021 | 55 | 53 |
| 2022 | 43 | 70 |
| 2023 | 54 | 49 |
| 2024 | 54 | 44 |
| 2025 | 38 | 36 |
| 2026 | 27 | 42 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G01F 23/64Of the free float type without mechanical transmission elements966
- G01F 23/32Using rotatable arms or other pivotable transmission elements575
- G01F 23/56Using elements rigidly fixed to, and rectilinearly moving with, the floats as226
- G01F 23/76Characterised by the construction of the float226
- G01F 23/40Using bands or wires as transmission elements146
- G01F 23/303Characterised by means to prevent fault-level readings due to turbulence of the46
- G01F 23/48Using twisted spindles as transmission elements29
- G01F 23/306Using radioactive radiation1
Recent patents
- Flame producing assembly6 Oct 2026US 12,754,058 B2BIC Violex Single Member S.A.
- Feed tank equipped with packing structure of float sensor and ice maker including the same22 Sep 2026US 12,742,580 B2BLUENIX Co., Ltd.
- Warming device capable of determining lowering of warming function, image forming apparatus, and determination method1 Sep 2026US 12,722,379 B2KYOCERA Document Solutions Inc.
- Method and device for detecting an impairment of a lever sensor18 Aug 2026US 12,710,305 B2Bayerische Motoren Werke Aktiengesellschaft
- Sensor arrangements, sensor systems, and methods for determining height of liquids in tanks11 Aug 2026US 12,704,398 B1Mopeka Products LLC
- Oil Level Sensing and Fault Detection8 Oct 2026US 2026/0309537 A1Textron Aviation Inc.
- Systems and Methods for Improved Asset Monitoring via Orientation Measurement8 Oct 2026US 2026/0313274 A1Silicon Controls Pty Ltd.
- Hub cap with oil level indicator1 Oct 2026US 2026/0298692 A1Aperia Technologies, Inc.
- Remote control box integrated with distribution board for smart farm irrigation17 Sep 2026US 2026/0271842 A1Korea Agriculture Institute Corporation
- Liquid level metering using inductive technology17 Sep 2026US 2026/0276428 A1Azoteq Holdings Limited
Most cited
By later US patents
- Automated statistical inventory reconcilation system for convenience stores and auto/truck service stations184US 5,400,253 ASouthern Power, Inc. · 1995
- Method of and apparatus for making a three-dimensional product by stereolithography148US 5,174,931 A3D Systems, Inc. · 1992
- Fluid monitoring apparatus and method148US 7,878,058 B2Walker Engineering Company · 2011
- Suction fitting with pump control device135US 5,167,041 AKDI American Products, Inc. · 1992
- Swimming pool control system134US 5,730,861 A1998